The fans are used for at least 3 purposes: Cooling computer cases, exchange of pre-installed or missing fans for CPU coolers and for mounting on radiators for water cooling. There are many s
upplier for fans, here you will find almost all: Aerocool, Akasa, Antec, Alpenföhn, Arctic Cooling, Be Quiet, BitFenix, Cooler Master, Coolink, Cooltek, Corsair, Cryorig, Enermax, Fractal Design, Gelid, Lepa, Noctua, Noiseblocker, NZXT, Papst, Phanteks, Phobya, Prolimatech, Raijintek, Revoltec, Scythe, Sharkoon, Silverstone, Thermalright, Thermaltake, Xigmatek, Xilence, Zalman.